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A theory of international relations is a set of ideas that explains how the international system works. Unlike an ideology, a theory of international relations is (at least in principle) backed up with concrete evidence. The two major theories of international relations are realism and liberalism.
National Interest
Most theories of international relations are based on the idea that states always act in accordance with their national interest, or the interests of that particular state. State interests often include self-preservation, military security, economic prosperity, and influence over other states. Sometimes two or more states have the same national interest. For example, two states might both want to foster peace and economic trade. And states with diametrically opposing national interests might try to resolve their differences through negotiation or even war.
According to realism, states work only to increase their own power relative to that of other states. Realism also claims the following:
Politicians have practiced realism as long as states have existed. Most scholars and politicians during the Cold War viewed international relations through a realist lens. Neither the United States nor the Soviet Union trusted the other, and each sought allies to protect itself and increase its political and military influence abroad. Realism has also featured prominently in the administration of George W. Bush.
Machiavelli
One of the best-known realist thinkers is the notorious Niccolo Machiavelli. In his book The Prince (1513), he advised rulers to use deceit and violence as tools against other states. Moral goals are so dangerous, he wrote, that to act morally will bring about disaster. He also gave advice about how to deal with conflicts among neighboring states and how to defend one’s homeland. Machiavelli’s name has become synonymous with nasty and brutal politics.
Liberalism emphasizes that the broad ties among states have both made it difficult to define national interest and decreased the usefulness of military power. Liberalism developed in the 1970s as some scholars began arguing that realism was outdated. Increasing globalization, the rapid rise in communications technology, and the increase in international trade meant that states could no longer rely on simple power politics to decide matters. Liberal approaches to international relations are also called theories of complex interdependence. Liberalism claims the following:
Example: Relations among the major Western powers fit a model of complex interdependence very well. The United States has significant disagreements with its European and Asian allies over trade and policy, but it is hard to imagine a circumstance in which the United States would use military power against any of these allies. Instead, the United States relies on economic pressure and incentives to achieve its policy aims.
Idealism is a specific school of liberalism that stresses the need for states to pursue moral goals and to act ethically in the international arena. Idealists believe that behavior considered immoral on an interpersonal level is also immoral in foreign policy. Therefore, idealists argue that dishonesty, trickery, and violence should be shunned. In the United States, idealism has usually been associated with the Democratic Party since World War I.
Example: As he negotiated the treaty to end World War I in 1918, Woodrow Wilson worked to promote democracy and national self-determination. Wilson’s idealism led him to push hard for the creation of the League of Nations, an international organization that would fight aggression and protect the weak from the strong, in 1919. Scholars use the term Wilsonian to describe a person or group who advocates promoting democracy overseas in the name of idealism.
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